P E Lazzerini1, P L Capecchi2, C Nizzi2, F Finizola2, E Morgioni2, S Bracco3, F Laghi-Pasini2. 1. From the Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Italy and lazzerini7@unisi.it. 2. From the Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Italy and. 3. Neuroimaging and Neurointervention Unit, University Hospital of Siena, Siena, Italy.